Solder strip and bus bar connecting structure
By designing the flat section of the extension of the welding belt to lay on the surface of the bus bar, an alloyed structure is formed, which solves the problems of dummy welding and glass fragmentation caused by the small contact area between the round wire welding belt and the bus bar, and achieves higher welding strength and Lower glass load.
Patent Information
- Application Number
- CN202323267857.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-09-14
- Filing Date
- 2023-12-01
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2033-12-01
AI Technical Summary
In existing photovoltaic modules, the contact area between the round wire welding belt and the bus bar is small, which easily leads to insufficient welding and welding tension. The height of the welding belt and the bus bar is higher after welding, resulting in the back glass being easily broken when laminated. crack.
Design a connection structure between welding tape and bus bar. The extension of the welding tape has a conductive inner core and a flux coating. The free end of the conductive inner core has a flat section. The flat section is mounted on the surface of the bus bar. The flux coating and bus bar form an alloy. to increase the contact area.
By increasing the contact area between the welding tape and the bus bar, the welding tension is enhanced, the welding tension is subjected to a height after welding is reduced, the back glass is loaded during lamination, and the glass is broken.
Smart Images
Figure CN222485198U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of photovoltaic components, in particular to a welding strip and bus bar connection structure. Background Art
[0002] In the solar photovoltaic industry, the welding ribbon used in MBB modules is round wire welding ribbon. When round wire welding ribbon is welded with busbar, the contact area is small, which is easy to cause abnormal welding. With the development of the photovoltaic industry, the glass in photovoltaic modules is getting thinner and thinner. Especially when TOPCon double-glass modules are laminated, the reaction force of the round wire welding ribbon on the back glass becomes larger, and the glass is easily broken during the module lamination process. Utility Model Content
[0003] In order to solve at least one technical problem in the prior art, the utility model provides a welding strip and bus bar connection structure.
[0004] The welding strip and bus bar connection structure of the utility model comprises a welding strip extension part and a bus bar, wherein the welding strip extension part extends from the end of the battery string, the welding strip extension part has a conductive inner core and a flux coating coated on the surface of the conductive inner core, the free end of the conductive inner core has a flat section, the welding strip extension part and the bus bar are cross-arranged, the flat section is placed on the surface of the bus bar, and the flux coating and the bus bar form an alloy structure.
[0005] In some embodiments, the length of the flat segment is greater than the width of the bus bar.
[0006] In some embodiments, the conductive core is copper.
[0007] In some embodiments, the material of the solder coating is one of tin-lead alloy, tin-lead-silver alloy, tin-silver-copper alloy, tin-silver alloy, tin-lead-bismuth alloy and tin-silver-bismuth alloy.
[0008] In some embodiments, the front side of the bus bar is also coated with a flux coating made of the same material as the flux coating on the surface of the solder ribbon.
[0009] In some embodiments, the cross section of the portion of the welding ribbon extension outside the flat section is circular or triangular.
[0010] The utility model arranges the portion where the welding strip and the bus bar are welded to a flat shape, thereby increasing the contact area between the welding strip and the bus bar, improving the ability to withstand welding tension, and at the same time reducing the height after the circular welding strip and the bus bar are welded, thereby reducing the force load between the back glass and the welding strip during lamination. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a front view of a connection structure between a welding strip and a bus bar according to an embodiment of the present disclosure.
[0012] Figure 2 A side view of a welding strip extension portion of a welding strip and busbar connection structure according to an embodiment of the present disclosure DETAILED DESCRIPTION
[0013] In the prior art, the contact area between the traditional round wire welding strip or triangular welding strip and the tin layer of the busbar is small, which is prone to cold welding and insufficient welding tension. In addition, the height of the welding strip and the busbar after welding is relatively high. When laminating and packaging photovoltaic modules, especially packaging ultra-thin TOPCon modules, the buffer distance between the adhesive film layer and the back glass becomes smaller, which is prone to explosion abnormalities. In order to solve the problems existing in the prior art, the present disclosure provides a welding strip and busbar connection structure.
[0014] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.
[0015] Please refer to Figure 1 and Figure 2 The welding strip and bus bar connection structure comprises a welding strip extension 1 and a bus bar 2. The welding strip extension 1 extends from the end of the battery string 3, and the welding strip extension 1 has a conductive inner core and a flux coating coated on the surface of the conductive inner core, and the free end of the conductive inner core has a flat section 4. The welding strip extension 1 is arranged crosswise with the bus bar 2, the flat section 4 is placed on the surface of the bus bar 2, and the flux coating and the bus bar 2 form an alloy structure.
[0016] The battery string 3 includes a plurality of battery cells connected in series by a welding ribbon group. The welding ribbon on the end battery cell of the battery string 3 extends outward to form a welding ribbon extension portion 1. The welding ribbon extension portion 1 can be welded to the bus bar 2 to collect the current collected from the battery cell to the bus bar 2. There can be multiple welding ribbon extension portions 1 of the end battery cell in parallel.
[0017] In the prior art, the middle welding strip connecting the middle battery cells of the battery string 3 in series and the end welding strip connected to the end battery cells are welding strips of the same shape. However, the middle welding strip connecting the middle battery cells of the battery string 3 of the present disclosure is a conventional welding strip, such as a completely round wire welding strip or a completely triangular welding strip, or a segmented welding strip flattened near the battery cell gap, and the free end of the welding strip extension portion 1 extending from the end battery cell of the battery string 3 of the present disclosure is flat.
[0018] On the production line, the free end of the conductive inner core of the soldering strip can be flattened, and then a flux coating is coated on the surface of the conductive inner core to form the end soldering strip of the structure described in the present disclosure.
[0019] The flat segment 4 is overlapped on the busbar 2 and infrared or electromagnetic heating can be used. If the welding strip is a low-temperature welding strip, the high temperature during lamination can also be used to melt the flux coating on the surface of the flat segment 4 to form an alloy structure with the busbar 2.
[0020] The utility model arranges the portion where the welding strip is welded to the bus bar 2 to be flat, thereby increasing the contact area between the welding strip and the bus bar 2, improving the ability to withstand welding tension, and at the same time reducing the height after the circular welding strip is welded to the bus bar 2, thereby reducing the force load between the back glass and the welding strip during lamination.
[0021] In one embodiment, the length of the flat section 4 is greater than the width of the busbar 2. The flat section 4 extends to the end of the welding ribbon extension 1, and the length of the flat section 4 is greater than the width of the busbar 2. When the welding ribbon extension 1 intersects with the busbar 2, the flat section 4 is completely on the busbar 2.
[0022] In one embodiment, the conductive core is copper.
[0023] In one embodiment, the material of the solder coating is a tin alloy. For example, the material of the solder coating is one of tin-lead alloy, tin-lead-silver alloy, tin-silver-copper alloy, tin-silver alloy, tin-lead-bismuth alloy and tin-silver-bismuth alloy. The front side of the busbar is also provided with a solder coating, and the material is the same as the solder coating material on the surface of the solder strip.
[0024] In one embodiment, the cross section of the portion of the welding strip extension 1 other than the flat section 4 is circular or triangular.
[0025] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.
Claims
1. A welding strip and busbar connection structure, characterized in that: include: A solder strip extension portion extending from an end of the battery string, the solder strip extension portion having a conductive inner core and a flux coating coated on a surface of the conductive inner core, and a free end of the conductive inner core having a flat section; as well as The bus bar, the welding strip extension portion and the bus bar are arranged crosswise, the flat section is placed on the surface of the bus bar, and the flux coating and the bus bar form an alloy structure.
2. The welding strip and busbar connection structure according to claim 1, characterized in that: The length of the flat segment is greater than the width of the bus bar.
3. The welding strip and busbar connection structure according to claim 1, characterized in that: The conductive inner core is copper.
4. The welding strip and busbar connection structure according to claim 3, characterized in that: The material of the solder coating is one of tin-lead alloy, tin-lead-silver alloy, tin-silver-copper alloy, tin-silver alloy, tin-lead-bismuth alloy and tin-silver-bismuth alloy.
5. The welding strip and busbar connection structure according to claim 4, characterized in that: The front side of the bus bar is also coated with a flux coating made of the same material as the flux coating on the surface of the solder strip.
6. The welding strip and busbar connection structure according to claim 1, characterized in that: The cross section of the portion of the welding strip extension portion other than the flat section is circular or triangular.